diff --git a/www/SITE.md b/www/SITE.md
index cc7f1312..acae8611 100644
--- a/www/SITE.md
+++ b/www/SITE.md
@@ -136,6 +136,7 @@ maturity.
 ## Primary nav
 
 The logo is the only Home control. Book stays at `/book` and in the footer.
+Security lives at `/security` and in the footer About group.
 Catalog, footer, and nav destinations are real HTML files at those paths.
 
 | Item              | Path        | Notes                                         |
@@ -145,6 +146,7 @@ Catalog, footer, and nav destinations are real HTML files at those paths.
 | Echo 2026         | `/e26`      | Edition + Spec TOC + suite                    |
 | Try               | `/try`      | In-browser check + playground run (wasm host) |
 | **Install** (CTA) | `/install`  | Solid button; get `xo`                        |
+| Security          | `/security` | Vulnerability mailbox + `SECURITY.md`         |
 
 ## Docs left rail
 
@@ -162,13 +164,22 @@ The home page is a language-docs front door. Copy and links live in
 3. First-class links: Documents (`/docs`), Packages (`/docs/std`), Spec (`/e26`)
 4. Footer
 
-Each of those links, plus Install, First program, Book, Try, Privacy, and
-Terms, is a real page (`path/index.html`) with that page title and body. A
-destination without a document is removed from the catalog or footer.
+Each of those links, plus Install, First program, Book, Try, Privacy, Terms,
+and Security, is a real page (`path/index.html`) with that page title and
+body. A destination without a document is removed from the catalog or footer.
 
 Homepage trust stays factual. Rust, LLVM, the public edition, and the
 machine-checked suite are implementation facts.
 
+## Security
+
+`/security` is the public reporting page. It points to
+`security@modoterra.xyz` and the repository `SECURITY.md`. The footer About
+group links there. Public mail uses `@modoterra.xyz` only. Discord stays
+omitted from the footer until there is a real invite.
+
+Copy and URLs live in `src/docs/site.ts` (`securityContact`, `footerLinkGroups`).
+
 ## Documents hub
 
 `/docs` is a short catalog. Groups: Start (install, first program, project),
@@ -191,11 +202,11 @@ Cross-links: Reference ↔ Spec ↔ suite pages keep the triangle explicit.
 ## Static pages
 
 `npm run build` writes `index.html` for every content route: the homepage,
-`/install`, `/try`, `/privacy`, `/terms`, and each page in `docsPages`
-(Documents, Packages, Spec, Book, First program, and the rest of the
-Reference / std / suite pages). Each file keeps the SPA shell and a noscript
-body from the same modules the React app renders. Unknown paths still use the
-`404.html` bounce.
+`/install`, `/try`, `/privacy`, `/terms`, `/security`, and each page in
+`docsPages` (Documents, Packages, Spec, Book, First program, and the rest of
+the Reference / std / suite pages). Each file keeps the SPA shell and a
+noscript body from the same modules the React app renders. Unknown paths
+still use the `404.html` bounce.
 
 Wasm bindings stay in `www/public/echo-wasm/`.
 
@@ -211,11 +222,11 @@ Compile and native run stay on `xo` (LLVM).
 
 Learn, Community, and About. Copy lives in `src/docs/site.ts` (`footerLinkGroups`).
 
-| Group     | Links                                                                       |
-| --------- | --------------------------------------------------------------------------- |
-| Learn     | Install, Try Echo, First program, Documents, Book, Echo 2026                |
-| Community | GitHub. Omit Discord until a public invite URL exists.                      |
-| About     | Modoterra (`https://modoterra.xyz`), Privacy (`/privacy`), Terms (`/terms`) |
+| Group     | Links                                                                                               |
+| --------- | --------------------------------------------------------------------------------------------------- |
+| Learn     | Install, Try Echo, First program, Documents, Book, Echo 2026                                        |
+| Community | GitHub. Omit Discord until a public invite URL exists.                                              |
+| About     | Modoterra (`https://modoterra.xyz`), Privacy (`/privacy`), Terms (`/terms`), Security (`/security`) |
 
 Public project mail on the site is `@modoterra.xyz` only (`hello@`, `security@`,
 `oss@`). Do not publish `@modoterra.com`.
@@ -226,10 +237,10 @@ They are not a consumer-app policy.
 ## Discovery
 
 `/sitemap.xml` lists the public catalog on `https://xo.run`: home, Install,
-Try, catalog and footer routes, and every shipped docs, Book, Echo 2026, and
-std page. `/robots.txt` allows crawlers and points at that sitemap. Privacy
-and Terms are listed only when those pages exist. Do not list the GitHub
-Pages host.
+Try, Security, catalog and footer routes, and every shipped docs, Book,
+Echo 2026, and std page. `/robots.txt` allows crawlers and points at that
+sitemap. Privacy and Terms are listed only when those pages exist. Do not
+list the GitHub Pages host.
 
 ## Out of scope (later)
 
diff --git a/www/scripts/verify-docs-pages.mjs b/www/scripts/verify-docs-pages.mjs
index 2d07395d..a28e5a1a 100644
--- a/www/scripts/verify-docs-pages.mjs
+++ b/www/scripts/verify-docs-pages.mjs
@@ -5,6 +5,7 @@
  * - footer About links Privacy and Terms; Discord stays hidden
  * - legal pages use @modoterra.xyz mail only
  * - Documents hub catalog groups
+ * - security mailbox, SECURITY.md, and footer /security pointer
  * - every language-feature catalog entry is a real page with a summary
  *   and at least one Echo code block
  * - catalog, footer, and nav destinations have static HTML snapshots
@@ -45,6 +46,7 @@ try {
     publicChromePaths,
     publicMailAddresses,
     renderStaticHomeAndHub,
+    securityContact,
     termsPage,
   } = site;
   const { docsPageByPath } = content;
@@ -95,6 +97,9 @@ try {
   if (footerByLabel.get("Terms") !== "/terms") {
     fail(`footer Terms should be /terms, got ${footerByLabel.get("Terms")}`);
   }
+  if (footerByLabel.get("Security") !== securityContact.path) {
+    fail(`footer Security should be ${securityContact.path}, got ${footerByLabel.get("Security")}`);
+  }
   if (footerByLabel.get("Modoterra") !== "https://modoterra.xyz") {
     fail("footer About must keep the Modoterra company link");
   }
@@ -135,6 +140,25 @@ try {
     }
   }
 
+  if (securityContact.email !== "security@modoterra.xyz") {
+    fail(`security mailbox must be security@modoterra.xyz, got ${securityContact.email}`);
+  }
+  if (/@modoterra\.com\b/.test(securityContact.email)) {
+    fail("public mail must use @modoterra.xyz, never @modoterra.com");
+  }
+  if (securityContact.mailto !== `mailto:${securityContact.email}`) {
+    fail("securityContact.mailto must match the public mailbox");
+  }
+  if (securityContact.path !== "/security") {
+    fail("securityContact.path must be /security");
+  }
+  if (!securityContact.policyUrl.includes("SECURITY.md")) {
+    fail("securityContact.policyUrl must point at SECURITY.md");
+  }
+  if (!securityContact.policyUrl.includes("github.com/modoterra/echo")) {
+    fail("securityContact.policyUrl must point at this repository");
+  }
+
   if (!primaryNavItemIsActive("/docs", "/docs/leaders")) {
     fail("Documents nav should be active on /docs/leaders");
   }
@@ -282,6 +306,9 @@ try {
     "/e26",
     "/docs/leaders",
     "/install",
+    securityContact.email,
+    securityContact.mailto,
+    "SECURITY.md",
   ]) {
     if (!snapshot.includes(needle)) {
       fail(`renderStaticHomeAndHub missing ${needle}`);
@@ -294,6 +321,7 @@ try {
     ["/docs/std", "Standard library"],
     ["/e26", "Echo 2026"],
     ["/install", "Install Echo"],
+    ["/security", "Security"],
     ["/docs/first-program", "First program"],
     ["/book", "Introduction"],
     ["/privacy", "Privacy"],
diff --git a/www/scripts/verify-prose.mjs b/www/scripts/verify-prose.mjs
index 72569ad8..2e57acf9 100644
--- a/www/scripts/verify-prose.mjs
+++ b/www/scripts/verify-prose.mjs
@@ -210,6 +210,7 @@ try {
     "src/app.tsx",
     "src/install.tsx",
     "src/legal.tsx",
+    "src/security.tsx",
     "src/router.tsx",
     "src/docs/site.ts",
     "src/docs/install-content.ts",
diff --git a/www/src/docs/site.ts b/www/src/docs/site.ts
index 27a8c01a..23e86419 100644
--- a/www/src/docs/site.ts
+++ b/www/src/docs/site.ts
@@ -51,6 +51,22 @@ export const primaryNav: SiteNavItem[] = [
 
 export const installCta: SiteNavItem = { label: "Install", to: "/install" };
 
+/**
+ * Public vulnerability reporting. Mailbox is @modoterra.xyz only.
+ * Discord stays omitted from the footer until there is a public invite.
+ */
+export const securityContact = {
+  email: "security@modoterra.xyz",
+  mailto: "mailto:security@modoterra.xyz",
+  path: "/security",
+  policyUrl: "https://github.com/modoterra/echo/blob/main/SECURITY.md",
+} as const;
+
+export const securityPage = {
+  title: "Security",
+  lead: "Report vulnerabilities by email. Do not open a public GitHub issue for a security report.",
+};
+
 export type FooterLink = {
   label: string;
   href: string;
@@ -96,6 +112,7 @@ export const footerLinkGroups: FooterLinkGroup[] = [
       },
       { label: "Privacy", href: "/privacy" },
       { label: "Terms", href: "/terms" },
+      { label: "Security", href: securityContact.path },
     ],
   },
 ];
@@ -512,6 +529,11 @@ export function renderStaticHomeAndHub(): string {
     `<pre>${escapeHtml(homePage.sample)}</pre>`,
     `<nav aria-label="Language surfaces"><ul>${surfaceLinks}</ul></nav>`,
     catalog,
+    `<aside>`,
+    `<h2>Security</h2>`,
+    `<p>Report vulnerabilities to <a href="${escapeHtml(securityContact.mailto)}">${escapeHtml(securityContact.email)}</a>.`,
+    ` Policy: <a href="${escapeHtml(securityContact.policyUrl)}">SECURITY.md</a>.</p>`,
+    `</aside>`,
     `</main>`,
   ].join("");
 }
diff --git a/www/src/docs/static-html.ts b/www/src/docs/static-html.ts
index 5c5664ec..a9db4657 100644
--- a/www/src/docs/static-html.ts
+++ b/www/src/docs/static-html.ts
@@ -9,6 +9,8 @@ import {
   homePage,
   legalPages,
   renderStaticHomeAndHub,
+  securityContact,
+  securityPage,
   tryPage,
   type LegalPageContent,
 } from "./site";
@@ -148,6 +150,17 @@ export function renderStaticTry(): string {
   ].join("");
 }
 
+export function renderStaticSecurity(): string {
+  return [
+    `<main>`,
+    `<h1>${escapeHtml(securityPage.title)}</h1>`,
+    `<p>${escapeHtml(securityPage.lead)}</p>`,
+    `<p>Email <a href="${escapeHtml(securityContact.mailto)}">${escapeHtml(securityContact.email)}</a> with a description of the issue and its impact, steps to reproduce or a proof of concept if available, and affected versions, commits, or platforms if known.</p>`,
+    `<p>The repository policy is <a href="${escapeHtml(securityContact.policyUrl)}">SECURITY.md</a>.</p>`,
+    `</main>`,
+  ].join("");
+}
+
 function documentTitle(pageTitle: string): string {
   return `${pageTitle} · Echo`;
 }
@@ -172,6 +185,12 @@ export function staticPages(): StaticPage[] {
       description: tryPage.lead,
       body: renderStaticTry(),
     },
+    {
+      path: securityContact.path,
+      title: documentTitle(securityPage.title),
+      description: securityPage.lead,
+      body: renderStaticSecurity(),
+    },
   ];
 
   for (const page of legalPages) {
diff --git a/www/src/router.tsx b/www/src/router.tsx
index b830273a..87b47524 100644
--- a/www/src/router.tsx
+++ b/www/src/router.tsx
@@ -26,6 +26,7 @@ import { EchoCode } from "./components/echo-code";
 import { Logo } from "./components/logo";
 import { InstallPage } from "./install";
 import { LegalPage } from "./legal";
+import { SecurityPage } from "./security";
 import { TryPage } from "./try";
 import {
   docsPageByPath,
@@ -342,8 +343,8 @@ function SiteFooter() {
                       <a
                         className="text-sm text-slate-500 transition hover:text-slate-950"
                         href={link.href}
-                        rel="noreferrer"
-                        target="_blank"
+                        rel={link.href.startsWith("mailto:") ? undefined : "noreferrer"}
+                        target={link.href.startsWith("mailto:") ? undefined : "_blank"}
                       >
                         {link.label}
                       </a>
@@ -951,6 +952,12 @@ const installRoute = createRoute({
   component: InstallPage,
 });
 
+const securityRoute = createRoute({
+  getParentRoute: () => rootRoute,
+  path: "/security",
+  component: SecurityPage,
+});
+
 const tryRoute = createRoute({
   getParentRoute: () => rootRoute,
   path: "/try",
@@ -1047,6 +1054,7 @@ const e26Children = [
 const routeTree = rootRoute.addChildren([
   indexRoute,
   installRoute,
+  securityRoute,
   tryRoute,
   privacyRoute,
   termsRoute,
diff --git a/www/src/security.tsx b/www/src/security.tsx
new file mode 100644
index 00000000..2532bf7c
--- /dev/null
+++ b/www/src/security.tsx
@@ -0,0 +1,75 @@
+import { securityContact } from "./docs/site";
+
+/**
+ * Public vulnerability reporting. Same mailbox and policy file as SECURITY.md.
+ */
+export function SecurityPage() {
+  return (
+    <main className="min-h-screen bg-white px-6 pb-24 pt-32 text-slate-950 sm:pt-36">
+      <div className="mx-auto w-full max-w-3xl">
+        <h1 className="text-3xl font-semibold tracking-normal text-slate-950 sm:text-4xl">
+          Security
+        </h1>
+        <p className="mt-4 text-pretty text-lg leading-8 text-slate-600">
+          Report vulnerabilities by email. Do not open a public GitHub issue for a security report.
+        </p>
+
+        <section className="mt-14">
+          <h2 className="text-xl font-semibold tracking-normal text-slate-950 sm:text-2xl">
+            Mailbox
+          </h2>
+          <p className="mt-4 text-pretty text-base leading-7 text-slate-600 sm:text-lg sm:leading-8">
+            Email{" "}
+            <a
+              className="font-semibold text-slate-800 underline-offset-4 hover:underline"
+              href={securityContact.mailto}
+            >
+              {securityContact.email}
+            </a>{" "}
+            with a description of the issue and its impact, steps to reproduce or a proof of concept
+            if available, and affected versions, commits, or platforms if known.
+          </p>
+        </section>
+
+        <section className="mt-14">
+          <h2 className="text-xl font-semibold tracking-normal text-slate-950 sm:text-2xl">
+            Policy
+          </h2>
+          <p className="mt-4 text-pretty text-base leading-7 text-slate-600 sm:text-lg sm:leading-8">
+            The repository policy is{" "}
+            <a
+              className="font-semibold text-slate-800 underline-offset-4 hover:underline"
+              href={securityContact.policyUrl}
+              rel="noreferrer"
+              target="_blank"
+            >
+              SECURITY.md
+            </a>
+            . We acknowledge receipt when we can and work with you on coordinated disclosure. Give a
+            reasonable window to investigate and ship a fix before public discussion.
+          </p>
+        </section>
+
+        <section className="mt-14">
+          <h2 className="text-xl font-semibold tracking-normal text-slate-950 sm:text-2xl">
+            Other bugs
+          </h2>
+          <p className="mt-4 text-pretty text-base leading-7 text-slate-600 sm:text-lg sm:leading-8">
+            Non-security bugs belong on{" "}
+            <a
+              className="font-semibold text-slate-800 underline-offset-4 hover:underline"
+              href="https://github.com/modoterra/echo/issues"
+              rel="noreferrer"
+              target="_blank"
+            >
+              GitHub issues
+            </a>
+            .
+          </p>
+        </section>
+      </div>
+    </main>
+  );
+}
+
+export default SecurityPage;